What Causes Abnormal Noise When Depressing the Clutch and Shifting Gears While Driving?

[OAllison]

Here are the reasons for abnormal noise when depressing the clutch and shifting gears while driving: 1. Slightly depress the clutch pedal to make the release lever contact the release bearing. If a "grinding" or "scraping" sound is heard, it indicates noise from the release bearing. If the noise persists after lubrication, the bearing is excessively worn and should be replaced. 2. If the noise occurs when the pedal is fully depressed and disappears when released, it suggests looseness or breakage of the clutch damper spring. 3. If the noise occurs when repeatedly depressing the pedal, either just as the clutch engages or disengages, it indicates loose rivets or excessive wear of the spline. 4. If there is intermittent collision noise, it may be due to axial play of the release bearing. In this case, the release bearing return spring should be replaced.

[McRiley]

I've been driving for almost twenty years, and the most common cause of this issue is a faulty clutch release bearing. When you press the clutch pedal and it squeaks, it means the ball bearings inside are severely worn. Sometimes it's a transmission problem, like worn synchronizers, which makes a noticeable clunking sound when shifting gears. If the noise is particularly loud when starting a cold engine but improves as it warms up, it's usually due to insufficient lubrication in the bearing. I once encountered a case where the sound resembled a whistle, and it turned out to be a seized pilot bearing. Ignoring this for too long can seriously damage the transmission gears. It's best to take it to a reputable repair shop for disassembly and inspection, and while you're at it, check the clutch disc thickness—don't just replace the bearing and call it a day.